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#!/bin/sh -ex
device=wlan0-1
tmp=/tmp/geolocate_scratch
# obtain an exclusive lock
exec 666>>/tmp/lock/geolocate
flock -w 5 -x 666;
# list neighbour wifis
iw dev $device scan >$tmp.scan
# construct HTTP request
( echo -n '{"request_address": true, "version": "1.1.0", "wifi_towers": ['
egrep <$tmp.scan -o -e '^BSS [0-9a-f:]{17}' -e '^[[:space:]]SSID.*' -e '^[[:space:]]signal: [0-9.-]*' \
| tr "\n\t" " " \
| sed 's/BSS /\n/g' \
| tail -n +2 \
| cut -d' ' -f1,4,7- \
| sed 's/^\([^ ]*\) \([^ ]*\) \(.*\) $/{"mac_address":"\1", "signal_strength":"\2", "ssid":"\3"}/' \
| tr "\n" , \
| sed 's/,$//'
echo ']}'
) >$tmp.json
( echo "POST /loc/json HTTP/1.0
Content-length: $(wc -c <$tmp.json)
"
cat $tmp.json
) >$tmp.request
# consult the ooracle
nc www.google.com 80 <$tmp.request >$tmp.response
# parse the response
tail -n1 $tmp.response \
| tr , "\n" \
| egrep -o -e '"latitude":[0-9.]*' -e '"longitude":[0-9.]*' -e '"street":"[^"]*' \
| sort \
| egrep -o '[^:"]*$' \
| {
read lon
read lat
read street
# store result
cat <<EOF
set system.position.lon=$lon
set system.position.lat=$lat
set system.position.street="$street"
EOF
uci batch <<EOF
set system.position.lon=$lon
set system.position.lat=$lat
set system.position.street="$street"
EOF
}
# clean up
rm $tmp*
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